US PATENT SUBCLASS 327 / 440
.~.~.~ GTO (i.e., gate turnoff)

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

365  DF  GATING (I.E., SWITCHING INPUT TO OUTPUT) {12}
419  DF  .~ Utilizing three or more electrode solid-state device {7}
438  DF  .~.~ Four or more layer device (e.g., thyristor, etc.) {6}
440.~.~.~ GTO (i.e., gate turnoff) {3}
441  DF  .~.~.~.~> Plural or combined with other four or more layer device
442  DF  .~.~.~.~> Separate ON and OFF control circuit
443  DF  .~.~.~.~> Transformer or inductor in control circuit

DEFINITION

Classification: 327/440

GTO (i.e., gate turnoff):

(under subclass 438) Subject matter including a four layer pnpn device similar in construction to an SCR, but which is

switched into a nonconduction state by a polarity reverse signal applied to the gate or control electrode.